.连接数据线，激光器会闪烁1-2秒？
先连接数据线，再连接电源线，最后打开电源开关。
（连接USB时，激光驱动那个引脚电平有点浮动，要加个下拉电阻拉稳）
（连接USB时，激光驱动那个引脚电平有点浮动，要加个下拉电阻拉稳）
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